I downloaded this for my "math-averse" 9 year old and the results have been astounding! Her mental mathematics have improved 100% making life easier for both of us (we homeschool) I recommend this app highly, I've developed quite an addiction to it myself, anyone who has ever been addicted to 'Bejeweled' will sympathise.
My only gripe is that, while it works beautifully on the iPad, on the iPhone 5 both Roman Numerals and Fractions jam on the intro page and I need to delete and reinstall the entire app.
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